Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f00b0d8c35071a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 01:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35b5841304898cb241d5ad3e3d2e19e9 SHA-1: e5624b58d5cdc739d20efd724dda1dae9bcbe1a0 SHA-256: 43f00b0d8c35071aac551c37b0de3f130ad28ea4e9d54dd8be451a190166c78f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=discrete+event+system+simulation+5th+edition+pdf+download+free PDF link annotation
    • https://koncnc.com/genelresimler/file/38507631189.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/bipikolalol.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/7822440658.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/76678329798.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/80984607065.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeef5b8f2---90514800521.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/viloligaxexedowotenaji.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/ropitanapidiforis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2879b66d49---sewuribelod.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/negitufekozome.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/gazirasositilisepive.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160726be75843a---84688339013.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf193d0459---bilogonamivameboruke.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/99773108026.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gs3glls9eo4q5cm6ttqhirn9ci/79560301041.pdfIn PDF document text
    • http://rc-modeller.se/images/file///69996121961.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/80418748881.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be525b55f---jeviwido.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf915fdcd---13912007136.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/19495845434.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cacc5b9537f1db5f5553fdcb75972ebe/wevifusatagusotidib.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/21756967688.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/tevukizomebapezu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20463045d5---xasabenipaz.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/35531893724.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 19460 bytes
SHA-256: 6f8f5d3c715904ff149f0de450144bf5de2c17882f9c6640f966f8ebc199d7f0
font_01_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377E 11384 bytes
SHA-256: 364a7d2083427d1815001460d9856e31aea3ad10269fd045851118415c54d655

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